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## Box-and-Whisker Plots

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**Box-and-Whisker Plots**Your gonna loves this! Isnt the kitty cute?**Step 1 – Order Numbers**1. Order the set of numbers from least to greatest**Step 2 – Find the Median**2. Find the median. The median is the middle number. If the data has two middle numbers, find the mean of the two numbers. What is the median?**Step 3 – Upper & Lower Quartiles**3. Find the lower and upper medians or quartiles. These are the middle numbers on each side of the median. What are they?**Step 4 – Draw a Number Line**Now you are ready to construct the actual box & whisker graph. First you will need to draw an ordinary number line that extends far enough in both directions to include all the numbers in your data:**Step 5 – Draw the Parts**Locate the main median12 using a vertical line just above your number line:**Step 5 – Draw the Parts**Locate the lower median8.5 and the upper median14 with similar vertical lines:**Step 5 – Draw the Parts**• Next, draw a box using the lower and upper median lines as endpoints:**Step 5 – Draw the Parts**Finally, the whiskers extend out to the data's smallest number 5 and largest number 20:**Step 6 - Label the Parts of a Box-and-Whisker Plot**Lower Quartile Median Upper Quartile Lower Extreme 3 1 2 Upper Extreme 4 5 Name the parts of a Box-and-Whisker Plot**Interquartile Range**The interquartile range is the difference between the upper quartile and the lower quartile. 14 – 8.5 = 5.5